Bug 1384813 - Show a header for "about:preferences#privacy-reports" content since we would like to show every content with a header. r=mconley

MozReview-Commit-ID: GmOxB0MOv3V

--HG--
extra : rebase_source : 900793c4b42cde37ad38e212c6fe8f3aff2a72bc

browser/components/preferences/in-content-new/privacy.xul

@@ -608,7 +608,8 @@
 <hbox id="dataCollectionCategory"
       class="subcategory"
       hidden="true"
-      data-category="panePrivacy">
+      data-category="panePrivacy"
+      data-subcategory="reports">
   <label class="header-name" flex="1">&dataCollection.label;</label>
 </hbox>